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Add FAQ for Exchange bench #1195

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Nov 11, 2021
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Add FAQ for Exchange bench #1195

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6 changes: 5 additions & 1 deletion docs-2.0/nebula-exchange/ex-ug-FAQ.md
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Expand Up @@ -110,4 +110,8 @@ Exchange是在Spark Writer基础上开发的Spark应用程序，二者均适用

- 支持更丰富的数据源，如MySQL、Neo4j、Hive、HBase、Kafka、Pulsar等。

- 修复了Spark Writer的部分问题。例如Spark读取HDFS里的数据时，默认读取到的源数据均为String类型，可能与Nebula Graph定义的Schema不同，所以Exchange增加了数据类型的自动匹配和类型转换，当Nebula Graph定义的Schema中数据类型为非String类型（如double）时，Exchange会将String类型的源数据转换为对应的类型（如double）。
- 修复了Spark Writer的部分问题。例如Spark读取HDFS里的数据时，默认读取到的源数据均为String类型，可能与Nebula Graph定义的Schema不同，所以Exchange增加了数据类型的自动匹配和类型转换，当Nebula Graph定义的Schema中数据类型为非String类型（如double）时，Exchange会将String类型的源数据转换为对应的类型（如double）。

### Exchange传输数据的性能如何？

Exchange的性能测试数据和测试方法参见[Nebula Exchange test result](https://github.com/vesoft-inc/nebula-exchange/blob/master/bench/exchange-test.md)。